I guess it was just too good to be true. A number of users who have downloaded this tweak experienced battery drainage issues with their iPhone4. I guess we could assume the same problem has hit iPod Touch 4G and iPhone 3G.
One of the users complained that after installing the tweak, his battery went down from 80% to 44% in just two hours, during which he has not used the handset.
Let us know if you have experienced similar problems with your device after installing Siri0us.